Quantitative analysis of mineral and energy resources : proceedings of the Nato Advanced Study Institute on Statistical Treatments for Estimation of Mineral and Energy Resources held at II Ciocco (Lucca), Italy, June 22-July 4, 1986 - Chung, C. F. ((Chang-Jo F.)); Fabbri, A. G.; Sinding-Larsen, R. (D. Reidel Publishing Company (Kluwer) ; Nato Scientific Affairs Division, 1998)